Definition
A list of pilot actions and verifications performed once the airplane has reached the desired cruising altitude and has been transitioned from climb to level flight. It typically includes setting cruise power, leaning the mixture as appropriate, adjusting trim, confirming engine instruments are in normal ranges, and verifying fuel, navigation, and systems status for the cruise segment of flight.
Plain English
A short set of checks the pilot runs through after the airplane levels off at cruise altitude, to make sure the airplane is properly set up for the long, steady part of the flight.
Context Anchor
Used after climb and level-off, once the airplane is flying steadily at its planned cruise altitude.
Derivation
"Cruise" comes from the Dutch kruisen, meaning to cross or sail to and fro, and over time came to mean travelling steadily at an efficient speed. In aviation it refers to the steady, level portion of a flight between climb and descent. So the cruise checklist is simply the checklist for that phase.
Why Pilots Care
Helps maintain consistent engine performance, fuel efficiency, and early detection of developing issues on longer flights.
Intuition Check
Do not read “cruise” here as casual or relaxed flight. In this context, cruise is a specific phase of flight, and the checklist is still a required cockpit habit.
Example Sentence 1
After leveling off at 6,500 feet, she reduced to cruise power, trimmed for level flight, and ran the cruise checklist.
Example Sentence 2
The cruise checklist confirmed that navigation radios were tuned correctly before the pilot relaxed into the enroute portion of the flight.